Re: Volvo Penta 4.3GL (2001) Good Vacuum Source
Well, yes. Unfortunately, boats don't usually have easy access to vacuum. The things that require vacuum in a car(like brakes, heat controls, cruise control, advance, etc.,) don't exist in a boat, therefore they don't have an easy place to get it most times. The "plugged hole or pipe" would be on the intake manifold, in the raised areas between the carb and the heads, excluding the front area which is usually a water jacket. If you find a place, you will know it once you open it up. A vacuum will start and the motor will start running rough(but won't hurt anything). Also, if there's a plugged tube at the base of the carb(usually rear) it will be a good source.